Abstract #3507
Reducing EPI Distortion with Gradient Slew Rate of 700 T/m/s in Human Brain Imaging
Ek T Tan 1 , Seung-Kyun Lee 1 , Dominic Graziani 1 , Matt A Bernstein 2 , John Huston 2 , Yunhong Shu 2 , Paul T Weavers 2 , Shengzhen Tao 3 , Joshua D Trzasko 3 , Jean-Baptiste Mathieu 4 , Christopher J Hardy 1 , John F Schenck 1 , and Thomas KF Foo 1
1
GE Global Research, Niskayuna, NY, United
States,
2
Radiology,
Mayo Clinic, Rochester, MN, United States,
3
Biomedical
Engineering, Mayo Clinic, Rochester, MN, United States,
4
GE
Healthcare, Florence, SC, United States
A second iteration of a dedicated head-only gradient
coil has been completed, allowing a slew rate of 700
T/m/s. Prior to imaging tests and in-vivo validation, we
performed simulations to understand the extent of
improvements to EPI at slew rates ranging from 200 T/m/s
(attainable in many whole-body MRI scanners) to 700
T/m/s. We observe that the higher gradient slew rate
will provide a greater than two-fold reduction in echo
spacing, and also result in significant reduction in
pixel distortion and increase in signal in the temporal
lobes of the brain.
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